Staff Engineer

What is Flagstone? 

Flagstone is many things. An online savings platform, reinventing how individuals, businesses, and charities manage, protect, and grow their cash. A diverse group of people, bound by a collaborative spirit, and shared purpose. And lastly, a thriving, profitable business – where smart people do their best work. 

Each definition shares a common thread: our unique culture. It’s our pride and joy. And our competitive advantage. 

A feel for our culture:

To revolutionise the savings market, we need to be at our best. But high performance takes more than talent – it takes a culture of kindness, respect, and growth.  

That’s why we’re building a diverse, inclusive community, where your voice is heard and valued. Where, with close support and room to develop, you can surpass even your own expectations. And be rewarded for it. 

We may not change the world, but we can change the world of financial technology. And all it takes is a winning mix of drive, talent, and empathy. Our culture celebrates all three. 
 
But enough about us. Let’s talk about you. 

Does this sound like you? 

You’re a passionate and experienced Staff Engineer with a background in both frontend and mobile development, who’s excited to forge a new way to save! You promote technical excellence and innovation within your engineering teams, and you’re excited about shaping technical strategy, mentoring others, and delivering high-quality, scalable solutions. 

What you’ll do: 

The Staff Engineer will take a leading role in driving technical strategy and ensuring the delivery of high-quality systems that meet our business objectives. You’ll partner with teams across the organisation to identify how technology can solve business challenges and take a long-term view on company value. 

You’ll also play a crucial role in mentoring and coaching engineers, helping them improve their system design skills and develop robust, scalable solutions. As a technical leader, you’ll provide strategic guidance while also contributing hands-on to key projects. This will focus on: 

• Technical Strategy: Set the technical vision in collaboration with Engineering Team Leads, aligning with wider business objectives.
• Solution Delivery: Contribute directly to building and maintaining high-quality systems while supporting and unblocking other engineers. 
• Mentorship: Coach and mentor engineers, promoting best practices in system design, coding standards, and testing. 
• Architecture & Design: Ensure scalable, reliable, and efficient system design with a forward-looking approach. 
• Operational Excellence: Champion the “you build it, you run it” philosophy, ensuring robust monitoring, alerting, and operational readiness. 
• Quality & Compliance: Maintain high-quality standards through code reviews, adherence to best practices, and risk management. 
• Collaboration: Work closely with Product Managers, stakeholders, and cross-functional teams to align technical decisions with business needs. 

 What you’ll bring:  

• Proven experience in a staff engineering, or similar, role. 
• Strong system architecture and design skills. 
• Thorough understanding of SOLID principles, TDD, DDD, and software design patterns. 
• Proficiency in frontend (ReactJS) and mobile (React Native) engineering. 
• Experience with Azure development and cloud-based infrastructure. 
• Understanding of security best practices (OWASP, etc.). 
• Excellent coaching, mentoring, and leadership skills. 
• Strong problem-solving abilities and strategic thinking. 
• Effective stakeholder management and influencing skills. 
• Agile and Scrum practices experience. 

How we reward you: 

At Flagstone, the benefits extend beyond false gifts like “fruit and snacks”. Instead, we invest in your health, wealth, and professional development. Here’s a selection of our benefits:  

• Competitive bonus scheme - designed to reward and recognise high performance
• Flexible benefits budget - a pot to fund meaningful benefits for you, whether it's hormone or fertility testing, cancer screening, neuro-diversity coaching or something that matters for you. 
• A range of salary sacrifice options to help you make tax efficient savings on electric cars, nursery schemes, home and tech goods. 
• Around the World scheme - 3 months work from anywhere scheme 
• Mental wellbeing support – Access therapy and mental health sessions through Spill 
• Learning and development – £1,000 personal development budget to help you grow in your role.  
• Private health care - Enjoy all the benefits AXA has to offer, including reduced gym memberships and medical history disregarded 
• Medical cash plan - To help you with the costs of dental and optical expenses 
• Life insurance and Income Protection- four times your annual salary for peace of mind 
• Matched pension contributions up to 5% 
• 25 days holiday - plus bank holidays, well-being days and volunteering days 

All are welcome. 

At Flagstone, we’re assembling a diverse team that defies our industry’s norms. Think this role could suit you? We encourage you to apply, no matter your background.